Grasshopper Docs

Community documentation for Grasshopper add-ons & plugins


ADDON. Version 1.1.0. Released on 2019-02-23. Provides 31 components. Created by Emil Poulsen. Features 0 video tutorials.
Emu is an interactive structural analysis and form-finding tool based on a 6DOF (6 degrees of freedom) formulation of the dynamic relaxation method allowing engineers and designers to run bi-axial bending and torsion simulations. It is aimed to be used in early design stages but yet giving real structural feedback. Emu was developed as part of a Master's thesis in Structural Engineering and Building Technology at Chalmers University of Technology, with the aim of simulating the very non-linear process of elastic gridshell erection.


Element Index Selector (ElementIndexSelector)
Retrieve element indices by filtering based on material, section and group.
Element Force Viewer (ElemForceView)
Ouput the internal forces and moments of elements
Diagram Viewer (DiagramViewer)
Show force diagrams on elements.
Results On Mesh Viz (MeshViz)
Visualize structural data on a beam mesh.
Centerline Viewer (CLineView)
View the centerline geometry. Plug your relax output into this component to see the geometry for each iteration.
Reaction Forces (ReactForce)
View the reaction forces in of model
Node Forces (NodeForce)
Extract the internal forces and moments of the nodes
Section Viewer (SectionView)
Visualize the extruded sections of the members in the model represented as meshes. The sections will correspond to what's been defined for each element.


Create a 6 DOF spring element. The spring can be used for geometrical form-finding, when structural quantaties (such as forces and moments) are not important.
Create a 6 DOF cable element. Cables are capable of transferring tension, but not compression.
Defines a Structural model. Assemble all elements, loads, restraints, materials and cross sections using this component.
Create a 12 DOF Beam element from a line, material and cross section. By default a steel material and a circular section is assigned to the beam.
Create a 6 DOF bar/truss element. No bending will occur in the elment, only axial force. In other words, the end nodes are only capable of transferring force, no moments.
Restrain a node's degrees of freedom
Defines a continous grid-shell lath element


Solid Box Section (SolidBoxSection)
Create a solid box section by providing a height and width.
Generic Section (GenericSection)
Create a generic cross section by providing numerical data.
Circular Section (CircularSection)
Create a Circular Hollow Section (CHS) based on a radius and a thickness.
IShape Section (IShapeSection)
Create an I Shape section by providing overall depth, overall width, top flange depth, web width, bottom flange width, and bottom flange depth
Hollow Box Section (HollowBox)
Create a Hollow Box Section by providing height, width and thickness.


Linear Load (LinearLoad)
Define a load per length unit [N/m]. Note that the line has to coincide with an existing linear element in the model.
Point Load (PointLoad)
Define a point load with a force vector [N] and a anchor point.
Area Load (AreaLoad)
Define an area load by a force vector [N/m2] and a mesh. Note that the all vertices of the mesh have to coincide with nodes in the model.
Gravity Load (GravityLoad)
Apply gravity load on a structure. The dead load of an element is calculated using information such as material density, the cross section applied and the geomety.


Dynamic Relaxation Properties (DrProp)
Properties to manually set the options for the Dynamic Relaxation solver.
Matrix Stiffness Solver (MatrixStiffnessSolver)
Solves the static equilibrium state of a Model. The underlying algorithm is based on solving the system of linear system of equations Ka=f.
Dynamic Relaxation Solver (DrSolver)
Solver using the Dynamic Relaxation method to find the equilibrium state of a model through time stepping. Connect the timer to this component to animate the process.


Mesh Vextex Normals (MeshVertexNormals)
Computes the vertex normals of a mesh. This is done by averaging the surrounding face normals around a vertex.
Gets information about the plugin


Custom Material (CustomMaterial)
Create a custom isotropic homogenious material
Material Database (Mat DB)
Material Database.

Site design © Robin Rodricks.   Co-created by Andrew Heumann.   Emu and associated data © 2022 Emil Poulsen.  
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